[Bug 244118] 13-CURRENT Kernel post r357547 hang during boot on PowerMac G5Q

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244118

--- Comment #8 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to Francis Little from comment #7)

If you have an appropriate swap/paging partition you might
be able to have /boot/loader.conf contain an assignment
of the general form:

dumpdev="/dev/<???>"

(substituting as necessary). Then you might be able
to cause a kernel dump from ddb (say). (Of cource,
this might run back into the same or other problems.)

If it worked, rebooting with vm.debug.uma_multipage_slabs="0"
should pick up that dump if you have room in /var/crash.
The dump might contain the tail of the sequence of lines
that would have gone into the log file. There might be a
way to extract those lines.

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